v3.24.1.1.u2
Employee Benefits - Summary of Defined Benefit Plans Amount Recognized in Group's Financial Statements (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Gratuity      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Funded status $ (4) $ (2)  
Prepaid defined benefit plan asset 2 3  
Accrued defined benefit plan liability (6) (5)  
Gratuity | Defined Benefit Obligations      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 216 227  
Transfer 4    
Service cost 37 34  
Interest expense/income 15 13  
Remeasurements - Actuarial losses / (gains) 4 (9)  
Benefits paid (19) (33)  
Translation differences (4) (16)  
Ending balance 253 216 $ 227
Gratuity | Plan Assets      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 214 226  
Interest expense/income 15 13  
Remeasurements - Returns on plan assets excluding amounts included in interest income 2 4  
Employer contribution 40 22  
Benefits paid (18) (32)  
Translation differences (4) (19)  
Ending balance 249 214 226
Pension      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Past service cost - plan amendments 4   (2)
Funded status (3) (6)  
Prepaid defined benefit plan asset 2 1  
Accrued defined benefit plan liability (5) (7)  
Pension | Defined Benefit Obligations      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 112 122  
Transfer   2  
Service cost 6 5  
Interest expense/income 2 1  
Remeasurements - Actuarial losses / (gains) 3 (17)  
Past service cost - plan amendments (4) 0  
Employee contribution 4 3  
Benefits paid (1) (6)  
Translation differences   2  
Ending balance 122 112 122
Pension | Plan Assets      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 106 111  
Transfer   2  
Interest expense/income 2 1  
Employee contribution 4 3  
Remeasurements - Returns on plan assets excluding amounts included in interest income 2 (11)  
Employer contribution 6 5  
Benefits paid (1) (6)  
Translation differences   1  
Ending balance 119 106 111
Provident Fund      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Accrued defined benefit plan liability (8) (42)  
Provident Fund | Defined Benefit Obligations      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 1,281 1,228  
Service cost 106 101  
Interest expense/income 92 78  
Remeasurements - Actuarial losses / (gains) 12 (10)  
Employee contribution 200 210  
Benefits paid (246) (226)  
Translation differences (21) (100)  
Ending balance 1,424 1,281 1,228
Provident Fund | Plan Assets      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 1,239 1,195  
Interest expense/income 89 76  
Employee contribution 200 210  
Fair value of plan assets at the beginning 1,239    
Remeasurements - Returns on plan assets excluding amounts included in interest income 28 (23)  
Employer contribution 126 104  
Benefits paid (246) (226)  
Translation differences (20) (97)  
Ending balance   1,239 $ 1,195
Fair value of plan assets at the end $ 1,416 $ 1,239